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Rev | Author | Line No. | Line |
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6148 | serge | 1 | /* |
2 | * Alpha optimized DSP utils |
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3 | * Copyright (c) 2002 Falk Hueffner |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | #include "libavutil/attributes.h" |
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23 | #include "libavcodec/mpegvideo.h" |
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24 | #include "asm.h" |
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25 | |||
26 | static void dct_unquantize_h263_axp(int16_t *block, int n_coeffs, |
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27 | uint64_t qscale, uint64_t qadd) |
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28 | { |
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29 | uint64_t qmul = qscale << 1; |
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30 | uint64_t correction = WORD_VEC(qmul * 255 >> 8); |
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31 | int i; |
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32 | |||
33 | qadd = WORD_VEC(qadd); |
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34 | |||
35 | for(i = 0; i <= n_coeffs; block += 4, i += 4) { |
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36 | uint64_t levels, negmask, zeros, add, sub; |
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37 | |||
38 | levels = ldq(block); |
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39 | if (levels == 0) |
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40 | continue; |
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41 | |||
42 | #ifdef __alpha_max__ |
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43 | /* I don't think the speed difference justifies runtime |
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44 | detection. */ |
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45 | negmask = maxsw4(levels, -1); /* negative -> ffff (-1) */ |
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46 | negmask = minsw4(negmask, 0); /* positive -> 0000 (0) */ |
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47 | #else |
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48 | negmask = cmpbge(WORD_VEC(0x7fff), levels); |
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49 | negmask &= (negmask >> 1) | (1 << 7); |
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50 | negmask = zap(-1, negmask); |
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51 | #endif |
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52 | |||
53 | zeros = cmpbge(0, levels); |
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54 | zeros &= zeros >> 1; |
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55 | /* zeros |= zeros << 1 is not needed since qadd <= 255, so |
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56 | zapping the lower byte suffices. */ |
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57 | |||
58 | levels *= qmul; |
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59 | levels -= correction & (negmask << 16); |
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60 | |||
61 | add = qadd & ~negmask; |
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62 | sub = qadd & negmask; |
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63 | /* Set qadd to 0 for levels == 0. */ |
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64 | add = zap(add, zeros); |
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65 | levels += add; |
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66 | levels -= sub; |
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67 | |||
68 | stq(levels, block); |
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69 | } |
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70 | } |
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71 | |||
72 | static void dct_unquantize_h263_intra_axp(MpegEncContext *s, int16_t *block, |
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73 | int n, int qscale) |
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74 | { |
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75 | int n_coeffs; |
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76 | uint64_t qadd; |
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77 | int16_t block0 = block[0]; |
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78 | |||
79 | if (!s->h263_aic) { |
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80 | if (n < 4) |
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81 | block0 *= s->y_dc_scale; |
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82 | else |
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83 | block0 *= s->c_dc_scale; |
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84 | qadd = (qscale - 1) | 1; |
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85 | } else { |
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86 | qadd = 0; |
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87 | } |
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88 | |||
89 | if(s->ac_pred) |
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90 | n_coeffs = 63; |
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91 | else |
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92 | n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]]; |
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93 | |||
94 | dct_unquantize_h263_axp(block, n_coeffs, qscale, qadd); |
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95 | |||
96 | block[0] = block0; |
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97 | } |
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98 | |||
99 | static void dct_unquantize_h263_inter_axp(MpegEncContext *s, int16_t *block, |
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100 | int n, int qscale) |
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101 | { |
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102 | int n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]]; |
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103 | dct_unquantize_h263_axp(block, n_coeffs, qscale, (qscale - 1) | 1); |
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104 | } |
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105 | |||
106 | av_cold void ff_MPV_common_init_axp(MpegEncContext *s) |
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107 | { |
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108 | s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_axp; |
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109 | s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_axp; |
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110 | }>><>=>><>><>=>><> |